USPS has posted an update regarding temporary service suspensions, including packages to Australia.
Currently, First Class package is unavailable, and packages to Australia may only be sent using Priority or Priority Express. Please select one of these options at check out as we will be unable to send First Class package at this time.
Please visit the USPS site for the most up to date information and other shipping regions impacted:
https://about.usps.com/newsroom/service-alerts/international/welcome.htm
We apologize for the inconvenience and hope full services will resume quickly.